Furnace-door mouthpiece.



F. W. BROOKS.

FURNACE DOOR MOUTHPIECE.

APPLICATION FILED MAR. 26, 1911.

Patented Mar. 19, 1912.

Inventor Witnesses I Attorneys UOLUMBIA PLANOGIAPN to. WAJMIN UNITED STATES PATENT OFFICE.

FREDERICK W. BROOKS, 0F VIRGINIA, MINNESOTA.

FURNACE-DOOR MOUTHPIEbE.

To all whom it may concern Be it known that I, FREDERICK W. BRooKs, a citizen of the United States, residing at Virginia, in the county of St. Louis and State of Minnesota, have invented a new and useful Furnace-Door Mouthpiece, of which the following is a specification.

This invention relates to steam boiler furnaees, and more especially to the door openings therein; and the object of the same is to provide a mouthpiece to surround said door opening for the purpose of keeping the heat of the furnace away from the calked seam around said opening. This object is accomplished by the construction hereinafter more fully described and claimed, and as shown in the drawings wherein- Figure 1 is an elevation of the lower end of an upright steam boiler furnace, showing its door as open. Fig. 2 is a horizontal section on the line 22 through Fig. 1. Fig. 8 is a vertical section on the line 3-3 through Fig. 1. Figs. 4 and 5 are perspective details of the face plate for the door opening, and the protector forming the subject matter of the present invention. Fig. 6 is a horizontal sectional View through the protector on the line 6--6 of Fig. 5.

In the drawings the letter WV designates the wall of a furnace, here an upright type of furnace used for heating water, 0 is the fire-door opening in said wall, and D is the door for closing this opening. It is well known that intense heat is generated in the fire boxes of these furnaces, and the walls thereof are sometimes protected from this heat by the use of fire brick or otherwise; but at the point where the door opening occurs no protector has been used, and the heat has access not only to the edge of the furnace wall there exposed but also to the rivets which make the calked seam that surrounds that opening where the wall of the furnace is double. The result is that the heat has a bad efi'ect upon the seam, the edges of the metal plates of which the double wall of the furnace is composed are burned, the rivets or their heads are similarly injured, and in time the boiler leaks around the door opening. It is the purpose of the present invention to overcome this objection as far as possible.

Coming now to the details shown in the drawings, the wall W is composed of an inner sheet 1 and an outer sheet 2, the latter being here illustrated as an upright cylin- Specification of Letters Patent.

Application filed March 25,

Patented Mar. 19, 1912.

1911. Serial No. 616,923.

drical shell and the inner sheet 1 around the door opening 0 being bent outward on an ogee curve at 3 and connected with the outer sheet by a series of rivets i extending around the door opening but spaced at little ways away from it. The door D is usually mounted upon a hinge 5 at one side of the opening, and its latch is engaged with a keeper or hook 6 at the other side thereof; and its body when it is closed lies over a face plate 7 best seen in Fig. 1 and which is usually riveted to and surrounds the edges of the sheets of metal of which the wall is composed.

By my present invention I provide a mouthpiece of any suitable metal, of a shape best seen in Fig. 5, and comprising an oval sleeve 10 at its smaller end surrounded by a series of holes 11 corresponding with a similar series numbered 12 in the face plate 7 for the passage of rivets 13 by which these two members are held together as seen in.

Fig. 2; an oval body 14- whieh is as long as the thickness of the wall WV and through which is extended the hole in or bore of the sleeve 10; and at the inner end of this body an annular or surrounding flange 15 beveled off around its outer edge as at 16 so as to engage against the shoulder formed by the ogee curve 3 of the inner sheet 1. All of this mouthpiece is by preference made in one piece of metal, and the distance from the outer face of the flange 15 to the outer end of the sleeve 10 is suflieient to admit the heads of the bolts 4; as seen in Fig. 2, so that they are thoroughly and carefully protected from the heat of the furnace. The calked seam between the sheets 1 and 2 of the furnace wall WV is also protected by this mouthpiece, and even the face plate itself has only the edge of its oval hole exposed to the heat. It is true the inner extremities of the rivets 13 are exposed to the heat within the fire box (unless the lire brick, if any are used, should cover the heads of these rivets), but if they become injured they can be replaced without permitting the furnace to leak around any of its seams.

In Fig. 6 I have shown how the mouthpiece could be providcd with a series of sockets 20 in the inner face of its flange, and a facing 21 as of plumbago or some vitrified material, such as clay applied thereto while in a plastic state and attaching itself by means of clings forming in said sockets While the facing Was setting. Obviously such a facing Would preserve the life of the mouthpiece Without departing from the principle of this invent-ion.

vVhat is claimed is The combination With a furnace having the Wall thereof composed of tWo sheets whereof the outermost is provided With a door opening and the innermost around said door opening defines an ogee bend toward the outermost sheet, rivets connecting said sheets immediately around said door opening and forming a seam, of a protector consisting of a single piece of material having a flange around the inner end of its body beveled at its periphery to engage against said ogee bend and a sleeve 'at-the outer end of its body projecting through the opening in said Wall, a face plate Whose periphery is larger than the size of the door opening in the outer sheet of the Wall, and rivets con necting the face plate With the sleeve of the said protector to clamp the periphery of the body against the inner sheetbeyond the seam.

In testimony that I claim the foregoing as my oWn, I have hereto afiixed my signature in the presence of tWo Witnesses.

FREDERICK W. BROOKS.

Witnesses N. B. ARNOLD, V. V. HEININGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D. C. 

